GE Interlogix 840, Руководство по установке

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Model 840/845 Contactless Smart Card Reader 25
The reader sounds a short triple beep every 30 seconds and the red LED
flashes quickly (every 400 ms):
Indicates a tamper violation.
The reader sounds a short triple beep every 30 seconds and the red LED is
on continuously:
Check that the 4-state supervised switches are connected
with two 1K-ohm resistors to the door contact and the exit request inputs or,
if the inputs are not used, that a 1K-ohm resistor is installed at the reader
connector. See Figure 4, “Wiring Diagram, Model 84x - Supervised F/2F
Mode,” on page 14.